High-precision single-point weighing sensor

Abstract

The high-precision single-point weighing sensor comprises an elastic body, a strain gauge, a PCB circuit board and a cable assembly, the elastic body comprises a left connecting part, an elastic intermediate body and a right connecting part which are connected in sequence, a protective shell is installed on the outer surface of the elastic intermediate body in a sealed mode, a groove-shaped hole is formed in the protective shell, and the strain gauge is arranged in the groove-shaped hole. A groove-shaped cover plate is mounted on the groove-shaped hole; a first elastic beam, a second elastic beam and a third elastic beam which are sequentially arranged from top to bottom are formed in the elastic middle body through hole grooves, an upper cover plate is further arranged above the first elastic beam, a lower cover plate is further arranged below the third elastic beam, and overload protection screws are further symmetrically arranged on the upper cover plate and the lower cover plate. The sensor designed by the utility model has the advantages of high precision, good stability, good lateral stress and torsional stress resistance, good impact load resistance, built-in overload protection, good sealing performance and easiness in cleaning.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a high-precision single-point weighing sensor. Background Art

[0002] With the continuous development of industrial automation systems, the role played by weighing sensors is becoming more and more important. They are widely used in many fields such as packaging, canning, industrial control, and the Internet of Things.

[0003] In the food hygiene industry, especially in the field of food canning, it not only requires the weighing sensor to have high accuracy and stable performance, but also requires the weighing sensor to have good resistance to lateral stress and torsional stress, good resistance to impact load, overload protection, excellent sealing performance, easy cleaning, antibacterial and other requirements. This puts higher requirements on the design of weighing sensors.

[0004] Therefore, a high-precision single-point weighing sensor is urgently needed. Utility Model Content

[0005] In order to solve the defects in the prior art, the utility model provides a high-precision single-point weighing sensor.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] The utility model provides a high-precision single-point weighing sensor, comprising an elastic body, a strain gauge, a PCB circuit board, a cable assembly, and a protective shell. The elastic body comprises a left connecting part, an elastic intermediate body and a right connecting part which are connected in sequence. The protective shell is sealed and installed on the outer surface of the elastic intermediate body. A slot-shaped hole is provided on the protective shell, and a slot-shaped cover plate is installed on the slot-shaped hole. A first elastic beam, a second elastic beam and a third elastic beam which are arranged in sequence from top to bottom are formed on the elastic intermediate body by opening a hole slot. An upper cover plate is also provided above the first elastic beam, and a lower cover plate is also provided below the third elastic beam. Overload protection screws are also symmetrically provided on the upper cover plate and the lower cover plate. The strain gauge is installed on at least one of the first elastic beam, the second elastic beam and the third elastic beam. The input end of the PCB circuit board is electrically connected to the output end of the strain gauge, and the output end of the PCB circuit board is electrically connected to the cable assembly. The cable assembly is installed on the outer end surface of the right connecting part.

[0008] Preferably, a left stress diaphragm and a right stress diaphragm are respectively provided at both ends of the length direction of the elastic intermediate body, and the connection between the left connecting part and the left stress diaphragm, and the connection between the right connecting part and the right stress diaphragm are connected frustum connecting parts and concave arc surface connecting parts, and the frustum connecting parts are respectively arranged close to the left connecting part and the right connecting part, and the outer diameter size of the frustum connecting part is arranged from large to small from the left connecting part to the left stress diaphragm direction, and from the right connecting part to the right stress diaphragm direction.

[0009] Preferably, sealing gaskets are sleeved on the side edges of the outer end surfaces of the left connecting part and the right connecting part.

[0010] Preferably, a circular hole is provided at the axial position of the outer end surface of the left connecting part, and a right slot hole for installing a cable assembly is provided at the axial position of the outer end surface of the right connecting part. A cover plate is sealed on the circular hole, and connecting parts for connecting to external mechanisms are provided on the outer end surface of the left connecting part and on both sides of the circular hole, and on the outer end surface of the right connecting part and on both sides of the right slot hole.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] (1) The elastic body of the utility model adopts a three-beam structure, which makes the performance of the entire sensor more stable and has good resistance to lateral stress and torsional stress, thereby preventing the sensor from being damaged by lateral stress and torsional stress.

[0013] (2) The utility model has a built-in overload protection function, which makes the sensor have a good ability to resist impact loads and prevents the sensor from being damaged by impact loads. The overload protection structure is simple and easy to produce.

[0014] (3) The utility model adopts laser welding as the overall connection method, which ensures that the protection level of the entire sensor reaches IP68 and IP69K.

[0015] (4) The utility model uses sealing rings on the two mounting end faces of the sensor for sealing, making the entire sensor easy to clean and without cleaning dead corners.

[0016] (5) The utility model uses positioning pin holes and threaded holes on the two end faces of the elastic body for installation, so that the positioning of the sensor and the scale pan during installation is more accurate, thereby ensuring the performance of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural cross-sectional view of a high-precision single-point weighing sensor of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of a high-precision single-point weighing sensor of the utility model;

[0019] Figure 3 This utility model Figure 2 Left view of;

[0020] Figure 4 This utility model Figure 2 Right view of . DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0022] In the description of the present invention, it should be understood that the terms "left" and "right" indicate directions or positional relationships based on the drawings in the specification. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 4 As shown, in this embodiment, a high-precision single-point weighing sensor is provided, including an elastomer 1, a strain gauge 2, a PCB circuit board 3, a cable assembly 4, and a protective shell 5.

[0025] In this embodiment, the elastic body 1 includes a left connecting portion 11, an elastic intermediate body 12 and a right connecting portion 13 which are connected in sequence. The protective shell 5 is sealed and installed on the outer surface of the elastic intermediate body 12. Two slot-shaped holes 51 are symmetrically provided on the protective shell 5. A slot-shaped cover plate 52 is installed on the slot-shaped hole 51. The protective shell is welded to the elastic intermediate body by laser (see Figure 2 ), the slotted cover is laser welded to the corresponding slotted hole on the shell (see Figure 2 ), thereby ensuring that the protection level of the entire sensor reaches IP68 and IP69K. In addition, the function of the two slotted holes is that when the protective shell is welded to the elastic intermediate body, the two slotted holes on the protective shell are used to adjust the eccentric load error of the sensor, thereby ensuring the accuracy of the sensor.

[0026] In this embodiment, the elastic intermediate body 12 is provided with holes and grooves to form a first elastic beam 121, a second elastic beam 122, and a third elastic beam 123 arranged in sequence from top to bottom. An upper cover plate 124 is also provided above the first elastic beam 121, and a lower cover plate 125 is also provided below the third elastic beam 123. Overload protection screws 126 are symmetrically provided on the upper cover plate 124 and the lower cover plate 125. The outer side surfaces of the upper cover plate 124 and the lower cover plate 125 are convex arc structures. The overload protection screws are installed in two corresponding threaded holes on the upper cover plate and the lower cover plate (see Figure 1 ), ensuring the gap between the end face of the overload protection screw head and the upper surface of the first beam 121 and the lower surface of the third beam 123, thereby ensuring the overload protection capability of the sensor and good impact load resistance.

[0027] In this embodiment, the strain gauge 2 is mounted on the upper and lower surfaces of the second elastic beam 122, the input end of the PCB circuit board 3 is electrically connected to the output end of the strain gauge 2, and the output end of the PCB circuit board 3 is electrically connected to the cable assembly 4, and the cable assembly 4 is laser welded to the outer end surface of the right connecting portion 13. The elastic body adopts a three-beam structure (see Figure 1 ), making the performance of the entire sensor more stable and having good resistance to lateral stress and torsional stress. In addition, welding the cable assembly to the elastomer ensures that the protection level of the entire sensor reaches IP68 and IP69K.

[0028] A left stress diaphragm 127 and a right stress diaphragm 128 are respectively provided at the two ends of the length direction of the elastic intermediate body 12. The connection between the left connecting part 11 and the left stress diaphragm 127, and the connection between the right connecting part 13 and the right stress diaphragm 128 are connected truncated cone connecting parts and concave arc surface connecting parts. The truncated cone connecting parts are respectively arranged close to the left connecting part 11 and the right connecting part 13, and the outer diameter size of the truncated cone connecting part is gradually reduced from the left connecting part 11 to the left stress diaphragm 127, and from the right connecting part 13 to the right stress diaphragm 128.

[0029] In this embodiment, the side edges of the outer end surfaces of the left connecting portion 11 and the right connecting portion 13 are also sleeved with sealing gaskets 6. The sealing rings are matched with the side edges of the outer end surfaces of the left connecting portion and the right connecting portion (see Figure 2 ), which plays the role of sealing the two end faces of the sensor (see Figure 3 and Figure 4 When the sensor is cleaned during use, the cleaning liquid will not flow into the gap between the two end faces of the sensor and the mounting surface of the client, including the fixed end face of the sensor (see Figure 4 ) and the gap between the client installation surface, sensor pan installation end surface (see Figure 3) and the gap between the installation surface of the client's scale pan, thereby ensuring that the sensor is easy to clean and there is no dead angle during cleaning.

[0030] In this embodiment, a circular hole 7 is further provided at the axial center position of the outer end surface of the left connecting portion 11, and a right slot hole for installing a cable assembly is further provided at the axial center position of the outer end surface of the right connecting portion 13. A cover plate 8 is sealed and installed on the circular hole 7. Connectors 9 for connecting to an external mechanism are further provided on the outer end surface of the left connecting portion 11 and on both sides of the circular hole, and on the outer end surface of the right connecting portion 13 and on both sides of the right slot hole. The connector 9 includes a positioning pin hole and a threaded hole (see Figure 3 and Figure 4 The cover is laser welded to the circular hole on the outer end face of the left connection (see Figure 3 ), ensuring that the protection level of the entire sensor reaches IP68 and IP69K.

[0031] The working principle of this embodiment is further described below:

[0032] When the sensor is used, the right connecting part 13 is connected through the positioning pin hole and the threaded hole (see Figure 4 ) Position and fix the sensor, the left connecting part 11 is connected through the positioning pin hole and threaded hole (see Figure 3 ) Position and fix the client's scale pan. The installation of the elastomer is achieved by using the positioning pin holes and threaded holes on the two end faces, so that the sensor and the scale pan have high installation accuracy, thereby ensuring the performance of the sensor.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-precision single-point weighing sensor, characterized in that: The invention comprises an elastic body (1), a strain gauge (2), a PCB circuit board (3), a cable assembly (4), and a protective shell (5); the elastic body (1) comprises a left connecting portion (11), an elastic intermediate body (12), and a right connecting portion (13) which are connected in sequence; the protective shell (5) is sealed and mounted on the outer surface of the elastic intermediate body (12); a slot-shaped hole (51) is formed on the protective shell (5); a slot-shaped cover plate (52) is mounted on the slot-shaped hole (51); a first elastic beam (121), a second elastic beam (122), and a third elastic beam (123) are formed in sequence from top to bottom by opening slots on the elastic intermediate body (12); the first elastic beam ( An upper cover plate (124) is also provided above the first elastic beam (121), a lower cover plate (125) is also provided below the third elastic beam (123), overload protection screws (126) are also symmetrically provided on the upper cover plate (124) and the lower cover plate (125), the strain gauge (2) is mounted on at least one of the first elastic beam (121), the second elastic beam (122) and the third elastic beam (123), the input end of the PCB circuit board (3) is electrically connected to the output end of the strain gauge (2), the output end of the PCB circuit board (3) is electrically connected to the cable assembly (4), and the cable assembly (4) is mounted on the outer end surface of the right connecting portion (13).

2. The high-precision single-point weighing sensor according to claim 1, characterized in that: A left stress diaphragm (127) and a right stress diaphragm (128) are respectively provided at both ends of the length direction of the elastic intermediate body (12); the connection between the left connecting portion (11) and the left stress diaphragm (127), and the connection between the right connecting portion (13) and the right stress diaphragm (128) are connected truncated cone connecting portions and inner concave arc surface connecting portions; the truncated cone connecting portions are respectively arranged close to the left connecting portion (11) and the right connecting portion (13); and the outer diameter of the truncated cone connecting portions is arranged to gradually decrease from the left connecting portion (11) to the left stress diaphragm (127), and from the right connecting portion (13) to the right stress diaphragm (128).

3. The high-precision single-point weighing sensor according to claim 1, characterized in that: Sealing gaskets (6) are also sleeved on the side edges of the outer end surfaces of the left connecting portion (11) and the right connecting portion (13).

4. The high-precision single-point weighing sensor according to claim 1, characterized in that: A circular hole (7) is also provided at the axial center position of the outer end surface of the left connecting portion (11), a right slot hole for installing a cable assembly is also provided at the axial center position of the outer end surface of the right connecting portion (13), a cover plate (8) is sealedly mounted on the circular hole (7), and connecting parts (9) for connecting to an external mechanism are also provided on the outer end surface of the left connecting portion (11) and located on both sides of the circular hole, and on the outer end surface of the right connecting portion (13) and located on both sides of the right slot hole.

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